To show the snackbar on the following page, you could pass the snackbar function to the page you are navigating to and then call it in that page's initState, using the method mentioned in this answer: https://stackoverflow.com/a/50682918/16045128
WidgetsBinding.instance?.addPostFrameCallback((_) { widget.feedback?.call(); });
Feedback Snackbar Demo:
class Home extends StatefulWidget { const Home({Key? key}) : super(key: key); @override State<Home> createState() => _HomeState(); } class _HomeState extends State<Home> { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( centerTitle: true, title: const Text('Home Page'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: const <Widget>[ Icon(Icons.home), SizedBox(height: 15), Text( 'Home Page', ), ], ), ), floatingActionButton: Row( mainAxisAlignment: MainAxisAlignment.end, children: [ Tooltip( message: "Show Snackbar", child: ElevatedButton( onPressed: () { Navigator.of(context).push( MaterialPageRoute( builder: (context) => SecondPage( feedback: () { ScaffoldMessenger.of(context).showSnackBar( const SnackBar( content: Text('You have reached the second page.'), duration: Duration(seconds: 3), ), ); }, ), ), ); }, child: const Icon(Icons.check), ), ), const SizedBox(width: 15), Tooltip( message: "Don't Show Snackbar", child: ElevatedButton( onPressed: () { Navigator.of(context).push( MaterialPageRoute( builder: (context) => const SecondPage(), ), ); }, child: const Icon(Icons.close), ), ), ], ), ); } } class SecondPage extends StatefulWidget { const SecondPage({Key? key, this.feedback}) : super(key: key); final Function? feedback; @override _SecondPageState createState() => _SecondPageState(); } class _SecondPageState extends State<SecondPage> { @override void initState() { super.initState(); WidgetsBinding.instance?.addPostFrameCallback( (_) { widget.feedback?.call(); }, ); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( centerTitle: true, title: const Text('Second Page'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: const <Widget>[ Icon(Icons.two_k), SizedBox(height: 15), Text( 'Second Page', ), ], ), ), ); } }
